Composition for preventing smut of printing-ink.



s'rn'rns CHARLES HERMAN RACKLE, OF NEW YORK, N. Y., ASSIGNOR TO PRINTING INK COMPOUND (10., OF NEW YORK, N. Y., A CORPORATION OF NEW YORK.

I COMPOSITION FOR PREVENTING SMUT OF PRINTING-INK.

No Drawing.

I To all whom it may concern:

, ink not setting or drying fast enough on the Be it-known that 1, CHARLES HERMAN 'RAoKLE, a citizen of the United States, and a resident of the city of New York, borough of Manhattan, in the county and State of New York, have invented a new and Improved Composition for Preventing Smut of Printing-Ink, of which the following is a full, clear, and exact description.

The invention relates to a mixture which when added to printing ink will prevent what is termed in the printing industry offset or smut. It will also prevent the printing sheets from sticking together.

Ofi'set or smut is caused by the printing paper during the operation of printing and in consequence the printed side of the sheet when coming in contact with the clean unprinted side rubs or smuts, thus defacing the clear effect of the printing and also injuring the unprinted side of the sheet. To prevent this it was necessaryto interleave each printed sheet as it left the press. This necessitated an extra expense in material and also in time of printing.

An object of my invention is to dispense with the delay in printing and the Interleaving by introducing a mixture into the printing ink which will cause the same to set rapidly and thereby prevent offset or smut. Another object of the invention is to provide a composition Which can be used with any kind of printing ink of any color.

The mixture is formed of tallow, preferably mutton tallow; varnish, which is preferably fluid, that is, not too thick; starch, preferably cornstarch; paraflin oil; and oil of citronella. Although the mixture can be made as good with any tallow and with any starch, better results are obtained with mutton tallow and with cornstarch.

The ingredients are used in substantially the following-proportions by weight:

Specification of Letters Patent.

Application filed July 31, 1917. Serial No. 183,721.

Patented July 9, 19118.

Tallow 7 lbs.

54.37% Varnish 2.75 lbs. 21.36% Starch l 2 lbs. 15.53% Paraffin oil 1- lb. 7.77% ()ilof citronella 2 oz. .97%

These ingredients are thoroughly mixed and ground together by the aid of a roller mill, used in preparing paints or inks.

This mixture when added to ink eliminates the ofi'setting or smutting of the printing ink. The quantity to be added to the ink may vary according to the fluidity and character of the printing ink used. With some inks the quantity to be added reaches as high as one ounce per pound. Experiments performed with the mixture have'shown' that the quantity of varnish, starch, tallow, and oil may be varied without materially impairingthe efliciency. of the mixture; and

although I have given the relative quantities of the ingredients which produce the best mixture, I do not wish to be limited to the exact proportions given.

I claim: 1. Acomposition for preventing smut of rintin ink consistin of tallow varnish starch, parafiin oil, and oil of citronella, in

specified.

CHARLES HERMAN RACKLE. 

